Refrigeration Circuit; [A] Applicable Parts; [B] Service Instructions; [C] Refrigerant Control (Compressor Cooling) - Hoshizaki TM-500AAE Service Manual

5. REFRIGERATION CIRCUIT

[a] APPLICABLE PARTS

Refrigerant (R404A)
Compressor
Evaporator Tank
Air-cooled Condenser
Air-cooled Condenser Fan Motor (1 pc)
Drier
Solenoid Valve
Strainer
Thermal Expansion Valve
Access Valve
Heat Exchanger

[b] SERVICE INSTRUCTIONS

Always restore the original bindings after servicing the refrigeration circuit. Otherwise, vibration
may cause overstress and damage to the circuit, resulting in refrigerant leak.
After replacing the Evaporator (Drum), Mechanical Seal, Bearing, or Oil Seal, run the icemaker
for 30 minutes to produce ice, check for impurities, and discard.

[c] REFRIGERANT CONTROL (Compressor Cooling)

See "1. WATER AND REFRIGERANT CIRCUIT".
Fan Cooling
The Fan Motor blows air over the Compressor to release its heat.

[d] REFRIGERANT CONTROL (Ice Production Control)

Fan Speed Control
Increased ice production in a low temperature condition will overload and damage the icemaking
mechanism. To control the ice production, the Controller Board energizes and de-energizes
the Fan Motor to reduce its rotation speed.

[e] REFRIGERANT

The icemaker employs refrigerant R404A which itself is not flammable or poisonous. However,
a small room filled with R404A may cause suffocation with a lack of oxygen. Also, when exposed
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